RPi 2B V1.1 RUN stuck low

[maxolydian]

Hi everyone!

I've got an RPi2B V1.1 that won't boot- it used to work fine, but after some rough treatment (I'm so sorry, my little pi-baby!), it's completely dead.

After a bit of digging, I've found that for some reason the RUN signal is stuck low. I've come across some schematics (after considerable digging, mind you!) and I'm suspecting either a missing pullup to 3V3, or a shorted cap to GND. My efforts to fix this thing are frustrated by the fact that I can't find a complete, accurate schematic- and a board layout would be nice as well.

I've found some partial schematics, but nothing specifically for the 2BV1.1, and what I have found doesn't really jibe with what I've got in my hand. I've traced it on my device, but the RUN signal goes from the jumper and pops up underneath the BCM2836, so it's pretty tough to figure out where it's headed after that. Some schematics have pointed my towards R15 and C97, but I can't find C97, and R15, although connected to 3V3 on one side, is not directly connected to RUN on the other, and is 100k anyway...

I've poked and probed trying to find the other side of the RUN signal to no avail. I know the pi is only $35, so not terrible if I trash it and buy another, and I'd be upgrading anyway- but it still irks me that there's just so much info available, but not quite enough to find all my answers...

So anyway- am I missing the big treasure-trove of information somewhere, or does it not exist at the hardware level? I love the pi, and there's definitely a bunch of higher-level info out- but it's fun to get into the mud every now and then too!




. I've seen some that show the pullup (R15) and cap (C97) https://www.raspberrypi.org/app/uploads ... .2_027.pdf, but that shows a BCM2835, and I've got a 2836 on my pi.
The RUN signal on my board hits the "RUN" jumper, test point PP21, and then disappears under the BCM2836. I've got an R15 on my board, but it's pretty far away from the action-[/list]

[klricks]

The partial schematics on the RPi documentation site and the full schematic of the original RPi 1B that you found is all there is.
The RUN circuit on page 1 grid location 9-D was labeled P6 on the 1B boards.
I would expect that the RUN circuit on the newer boards is pretty much the same as the older boards. Though the parts designations may be different. Basically the RUN is a typical RC reset circuit that goes directly to the SOC.
The fault(s) could be anywhere in the board or likely internal to the SOC.
RIP........

[maxolydian]

Thanks- I understand it's probably a simple RC, and as I said, I was just trying to find out where the external R and C are located, if they're actually there at all. On my board, RUN is associated with testpoint PP21, which is not shown on the schematic I've got.

I fear you are correct, and it's time to call this one... but thanks for the effort!

[MaxK1]

You didn't by any chance solder a 2 pin header on and it shorted?